Loans Loans Modified in Trouble Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Modifications [Line Items]
Number of Loans	7	5	14	15
Pre-Modification Outstanding Recorded Investment	$ 88	$ 275	$ 148	$ 426
Post-Modification Outstanding Recorded Investment	88	275	148	426
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	0	1
Pre-Modification Outstanding Recorded Investment	0	0	0	63
Post-Modification Outstanding Recorded Investment	0	0	0	63
Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	0	2	0
Pre-Modification Outstanding Recorded Investment	47	0	47	0
Post-Modification Outstanding Recorded Investment	47	0	47	0
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	5	4	12	13
Pre-Modification Outstanding Recorded Investment	41	33	101	121
Post-Modification Outstanding Recorded Investment	41	33	101	121
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1	0	1
Pre-Modification Outstanding Recorded Investment	0	242	0	242
Post-Modification Outstanding Recorded Investment	$ 0	$ 242	$ 0	$ 242